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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* OCI specific temptables store. Needed because temporary tables
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* in Oracle are global (to all sessions), so we need to rename them
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* on the fly in order to get local (different for each session) table names.
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* Also used to be able to retrieve temp table names included in the get_tables()
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* method of the DB.
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*
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* @package core_dml
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* @copyright 2009 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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require_once(__DIR__.'/moodle_temptables.php');
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class oci_native_moodle_temptables extends moodle_temptables {
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/** @var int To store unique_session_id. Needed for temp tables unique naming (upto 24cc) */
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protected $unique_session_id; //
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/** @var int To get incrementally different temptable names on each add_temptable() request */
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protected $counter;
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/**
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* Creates new moodle_temptables instance
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* @param object moodle_database instance
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*/
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public function __construct($mdb, $unique_session_id) {
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$this->unique_session_id = $unique_session_id;
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$this->counter = 1;
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parent::__construct($mdb);
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}
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/**
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* Add one temptable to the store.
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*
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* Overridden because OCI only support global temptables, so we need to change completely the name, based
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* in unique session identifier, to get local-like temp tables support
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* tables before the prefix.
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*
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* Given one moodle temptable name (without prefix), add it to the store, with the
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* key being the original moodle name and the value being the real db temptable name
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* already prefixed
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*
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* Override and use this *only* if the database requires modification in the table name.
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*
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* @param string $tablename name without prefix of the table created as temptable
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*/
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public function add_temptable($tablename) {
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// TODO: throw exception if exists: if ($this->is_temptable...
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$this->temptables[$tablename] = $this->prefix . $this->unique_session_id . $this->counter;
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$this->counter++;
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}
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}
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